import React, {Component} from 'react';
import store from "../../redux/store";
import {createDecrementAction, createIncrementAction, createIncrementAsyncAction} from "../../redux/count_action";

class Count extends Component {

    // componentDidMount() {
    //     // 检测redux状态的改变
    //     store.subscribe(() => {
    //         this.forceUpdate();
    //     });
    // }

    // 加法
    increment = () => {
        const {value} = this.selectNumber
        store.dispatch(createIncrementAction(value * 1))
    }
    // 减法
    decrement = () => {
        const {value} = this.selectNumber
        store.dispatch(createDecrementAction(value * 1))
    }
    // 奇数加
    incrementIfOdd = () => {
        const {value} = this.selectNumber
        const count = store.getState()
        if (count % 2 !== 0) {
            store.dispatch(createIncrementAction(value * 1))
        }
    }
    // 异步加
    incrementAsync = () => {
        const {value} = this.selectNumber
        store.dispatch(createIncrementAsyncAction(value * 1, 500))
    }

    render() {
        return (
            <div>
                <h1>当前求和为：{store.getState()}</h1>
                <select ref={c => this.selectNumber = c}>
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                </select>
                <button onClick={this.increment}>+</button>
                &nbsp;
                <button onClick={this.decrement}>-</button>
                &nbsp;
                <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>
                <button onClick={this.incrementAsync}>异步加</button>
                &nbsp;
            </div>
        );
    }

}

export default Count;